There could be a fanfiction where Sans befriends a lost human child in the Underground. He shows the child the ropes, protecting them from other hostile monsters, and in the process, they form a deep bond. This kind of story can explore themes of friendship and trust.
One interesting little sans fanfiction could be about Sans having an adventure in a new, mysterious underground world. He might encounter strange creatures and have to use his unique abilities to get through various challenges.
A little sans fanfiction might also involve Sans time - traveling. He could go back to a time before the events of the game and try to change certain things for the better. This would open up a whole new set of storylines and character interactions, with Sans having to deal with the consequences of his actions in the altered timeline.
One interesting Dark Sans fanfiction could be 'The Darker Path of Dark Sans'. It explores his character in a more in - depth way, showing his inner turmoil and how he copes with the strange world he exists in. Another is 'Dark Sans: The Unseen Powers' which delves into his powers that are not fully shown in the original concept.
One interesting Sick Sans fanfiction could be about his unique battles. In some stories, he uses his special powers in very creative ways against his foes. For example, he might manipulate the environment in ways that are both unexpected and fascinating.
There's also a fanfiction titled 'Ink Sans and the Lost Colors'. In this story, Ink Sans loses his ability to create colors for his paintings, which is a crucial part of his power. He then embarks on a quest to find the source of his color - losing, which leads him to encounter many challenges and make new friends along the way.
One interesting 'sans fight fanfiction' story could be about an alternate universe where Sans has different powers during the fight. For example, he might be able to manipulate time in a more extreme way than in the original game.
I'm not really into that kind of fanfiction, but you can try looking on fanfiction - specific websites like Archive of Our Own. There might be some unique takes on the idea there.
There are many frisk and sans stories in fanfiction. Some might focus on their friendship adventures in the Underground. For example, there could be a story where they team up to solve a mystery that's been plaguing the monster community. They use their unique skills, with Frisk's determination and Sans' laid - back but clever thinking.
One interesting sans crossover fanfiction could be where Sans from Undertale crosses over with the world of Harry Potter. He might use his unique abilities like teleporting to surprise the wizards in Hogwarts. Another could be a crossover with the Pokémon world, where Sans teams up with Pikachu. Maybe he'd use his bone attacks along with Pikachu's electric shocks to battle villains.
The relationships are a big part. Seeing how Sans interacts with his little brother, whether it's protective or playful, adds depth to the story. It's like exploring a new side of Sans' character that we might not see in the original game.
There might be a fanfiction where Time Kid Sans has to face his own past versions. It could explore how he deals with the differences in personalities among his past selves and the challenges that come with it. This could involve a lot of self - discovery and growth for the character.
One interesting fanfiction could be about Sans and Frisk going on an adventure in an alternate Underground. In this story, they might encounter new monsters and have to solve different puzzles together.